One of the first things I remember about /a/ was when we were all excited over pineapple-butt-duster happening from one of our first great drawfags. So no, I think we've become more mild over the years.

I'll give you that it's becoming more blatant and the whole waifu thing continues to grow, but to say it wasn't sexual to a strong degree since the beginning is neglecting what the hawaiian punch banner is about and how old that image is. OS tan was just changed to vocaloid, Azasuke Wind was popular before black lagoon, current generation doesn't even know who longhorn train or falcoon are.

Today its Rustles. Yesterday was Xration. Ever since '97 its Tony Taka, and since forever its Urushihara. Magical skirts now exist and is balanced by how much more stuff shows up from comicket. Its been here since 4chan and before.